Definition

1. Noun:
   • Equality of extension or duration: The state or condition of having exactly the same spatial extent, scope, or length of time.

Usage

• The word "coextension" is a formal, often philosophical or technical term. It is used to describe a precise relationship where two or more things share identical boundaries in space or time.
• It is typically used in academic, logical, or scientific contexts, such as in metaphysics, geometry, or linguistics.

Examples

• Noun:
  • In logic, the coextension of two concepts means their sets of referents are identical.
  • The coextension of the lease and the rental agreement prevented any legal gaps in occupancy.
  • Philosophers debate whether the mind and the brain have perfect coextension.

Advanced Usage

• "Coextension of predicates": In logic and semantics, this refers to two predicates that apply to exactly the same set of objects.
  • The predicates "has a heart" and "has a kidney" are often cited as an example of coextension in biological organisms, though not necessarily conceptual identity.

Variants and Related Words

• Coextensive (adj): Having the same spatial or temporal extent; extending equally over the same area or duration.
  • The jurisdiction of the two agencies is coextensive.

Synonyms

• Congruence (in the context of spatial equality)
• Simultaneity (in the context of temporal equality)
• Equivalence in extent

Notes

• "Coextension" is distinct from simple similarity or overlap. It implies a complete and total equality in the scope, range, or duration being compared.
• It is often contrasted with terms like "extension" (the scope of something) and "intension" (the inherent meaning or definition of something).

Noun

1. equality of extension or duration